#!/usr/bin/env python
# -*- coding: utf-8 -*-
#----------------------------------------------------------------------
# Name:        wx.tools.wxget_docs_demo
# Purpose:     wx fetch and launch demo or docs
#
# Author:      Steve Barnes
#
# Created:     06-Aug-2017
# Copyright:   (c) 2017-2020 by Steve Barnes
# Licence:     wxWindows license
# Tags:        phoenix-port, py3-port
#
# Module to allow the correct version of the documents and/or demos to be
# launched after, if necessarily being fetched.
#----------------------------------------------------------------------

"""
wxget_docs_demo.py -- Launch the appropriate wx Docs or Demo.

Usage:
    wxget_docs_demo [docs|demo]

Will install if missing, the requested item for the current version and then
launch it.

Use: doc|demo --force to force a fresh download.
"""
import sys
import os
import subprocess
import webbrowser
import tarfile
import warnings
from urllib.error import HTTPError
import urllib.request as urllib2
import urllib.parse as urlparse
from urllib.request import pathname2url

import wx
from wx.tools import wxget

print(sys.version_info, sys.version, sys.argv)
APP = None
if wx.VERSION[0] != 4:
    raise ValueError("wx Versions other than 4 not currently supported!")

def ensure_wx_app():
    """ Ensure that there is a wx.App instance."""
    global APP
    if APP is None and not wx.GetApp():
        APP = wx.App()
        APP.SetAppName("wxPython")
    return (APP is not None)

def get_paths_dict():
    """ Get a dictionary of the required paths."""
    global APP
    ensure_wx_app()
    sp = wx.StandardPaths.Get()
    pathdict = {}
    pathdict['TempDir'] = sp.GetTempDir()
    pathdict['Cache'] = os.path.join(sp.GetUserLocalDataDir(), 'wxDocsDemoCache',
                                     wx.VERSION_STRING)
    pathdict['Docs_URL'] = wxget.get_docs_demo_url(False)
    #pathdict['wxDocs'] = os.path.join(sp.GetAppDocumentsDir(), 'wxDocs', wx.VERSION_STRING)
    pathdict['wxDocs'] = sp.GetAppDocumentsDir()
    pathdict['Docs_Name'] = "wxPython-docs-%s" % wx.VERSION_STRING
    pathdict['Demo_URL'] = wxget.get_docs_demo_url(True)
    #pathdict['wxDemo'] = os.path.join(sp.GetUserLocalDataDir(), 'wxDemo', wx.VERSION_STRING)
    pathdict['wxDemo'] = sp.GetUserLocalDataDir()
    pathdict['Demo_Name'] = "wxPython-demo-%s" % wx.VERSION_STRING
    pathdict['Ext'] = 'tar.gz'
    return pathdict

def unpack_cached(cached, dest_dir):
    """ Unpack from the cache."""
    print('Unpack', cached, 'to', dest_dir)
    with tarfile.open(cached, "r:*") as tf:
        try:
            tf.extractall(dest_dir, filter='data')
        except TypeError:
            warnings.warn('Falling back to less safe tarfile.extractall')
            tf.extractall(dest_dir)
    dest_dir = os.listdir(dest_dir)[0]
    return dest_dir

def get_item(final, url, cache, name, ext, forced=False):
    """ Get the item """
    print('Looking for', name, 'at', final)
    fullpath = os.path.join(final, name)
    if os.path.exists(fullpath) and not forced:  # Already exists
        return fullpath

    cached = os.path.join(cache, name)
    cached = os.path.extsep.join([cached, ext])
    print('Looking for cached', cached)
    if not os.path.exists(cached) or forced:  # No cached copy
        yes_no = wx.MessageBox(
            "\n".join(
                ["%s is not yet installed." % name,
                 "Go on-line to get it?",
                 "(Select No on charged or slow connections)"]),
            "Download Prompt", wx.YES_NO|wx.CENTER|wx.ICON_INFORMATION)
        if yes_no == wx.YES:
            cached = wxget.download_file(url, cache, force=forced, trusted=True)
        else:
            report_error("Download Cancelled!")

    if os.path.exists(cached):  # We now have a cached copy
        unpack_cached(cached, final)
    else:
        fullpath = None
    return fullpath

def report_error(err_text):
    """ Report a problem."""
    ensure_wx_app()
    wx.MessageBox(err_text, caption='ERROR!',
                  style=wx.OK|wx.CENTRE|wx.ICON_ERROR)

def done(result=0):
    """ Tidy up and exit."""
    global APP
    if APP:
        print("Closing Launcher App!")  # Debug
        if result:
            print(result)
        wx.Exit()
    print("Done!")
    sys.exit(result)

def docs_main(args=sys.argv):
    """ Get/Launch Docs."""
    ensure_wx_app()
    result = 0
    print("Launch Docs for wxPython V%s" % wx.VERSION_STRING)
    pd = get_paths_dict()
    location = get_item(pd['wxDocs'], pd['Docs_URL'], pd['Cache'],
                        pd['Docs_Name'], pd['Ext'], forced="--force" in args)
    if location:
        location = os.path.join(location, 'docs', 'html', 'index.html')
        location_url = urlparse.urljoin('file:', pathname2url(location))
        print("Show Docs at:", location)
        webbrowser.open(location_url)
    else:
        result = 'Unable to find and show the wxPython Documentation!'
        report_error(result)
    done(result)

def demo_main(args=sys.argv):
    """ Get/Launch Demo."""
    result = 0
    ensure_wx_app()
    print("Launch Demo for wxPython V%s" % wx.VERSION_STRING)
    pd = get_paths_dict()
    location = get_item(pd['wxDemo'], pd['Demo_URL'], pd['Cache'],
                        pd['Demo_Name'], pd['Ext'], forced="--force" in args)
    if location:
        cmds = [sys.executable, os.path.join(location, "demo", "demo.py")]
        print("Launching", cmds[1])
        pid = subprocess.Popen(cmds).pid
        #subprocess.check_call(cmds) # Use instead for debug
        print("Demo starting as PID %s - may take a few seconds!" % pid)
    else:
        result = 'Unable to find and start the wxPython Demo!'
        report_error(result)
    done(result)

def main(args=sys.argv):
    """ Command line main."""
    if len(args) > 1:
        if "demo" in args[1].lower():
            return demo_main()
        elif "docs" in args[1].lower():
            return docs_main()
        #else:
    print(__doc__)
    #else:
        #APP = wx.App()

if __name__ == "__main__":
    main()